public static async Task <IActionResult> Run(
[HttpTrigger(AuthorizationLevel.Function, "get", Route = null)] HttpRequest req,
ILogger log)
{
#region validate input
// validate input parameter
string latStr = req.Query["lat"];
string lonStr = req.Query["lon"];
double lat, lon;
if (string.IsNullOrWhiteSpace(latStr) ||
string.IsNullOrWhiteSpace(lonStr) ||
!Double.TryParse(latStr, out lat) ||
!Double.TryParse(lonStr, out lon) ||
!(lat >= -90 && lat <= 90) ||
!(lon >= -180 && lon <= 180))
{
return(new BadRequestObjectResult("Please pass valid values for parameters ?lat=<value>&lon=<value> on the query string"));
}
#endregion
log.LogInformation($"Trucks location req received for {lat},{lon}");
#region fetch settings
// connection string to SQL DB
_sqlConnection.ConnectionString = Environment.GetEnvironmentVariable("DatabaseConnectionString");
// get the UUID for Maps API data from conguration
// TODO: Ideally should come from database after Maps API upload
var mapsDataUUID = Environment.GetEnvironmentVariable("MapsData.UUID");
// Maps API subscription key from Azure portal
var mapsSubsKey = Environment.GetEnvironmentVariable("MapsData.SubsKey");
#endregion
TruckLocator locator = new TruckLocator();
TruckInfoResponse resp = await locator.Locate(_sqlConnection, lat, lon, mapsDataUUID, mapsSubsKey);
return((ActionResult) new OkObjectResult(resp));
//catch(Exception ex)
//{
// return (ActionResult)new BadRequestObjectResult(ex.ToString());
//}
}
/// <summary>
/// Locates 5 closest points to a given point. It uses Maps API closest point algorithm. After the points are identified,
/// more properties like business name, type, hours of operation are appended to the response
/// </summary>
/// <param name="sqlConnection">static connection object</param>
/// <param name="lat">source latitude coordinate</param>
/// <param name="lon">source longitude coordinate</param>
/// <param name="mapsDataUUID">UUID that was returned by Maps API when the data was uploaded</param>
/// <param name="mapsSubsKey">Account key to access Maps API</param>
/// <returns></returns>
public async Task <TruckInfoResponse> Locate(SqlConnection sqlConnection, double lat, double lon, string mapsDataUUID, string mapsSubsKey)
{
Stopwatch sw = Stopwatch.StartNew();
TruckInfoResponse resp = new TruckInfoResponse();
// query MapsAPI Spatial - Get Closest Point
var qString = $"?subscription-key={mapsSubsKey}&api-version=1.0&udid={mapsDataUUID}&lat={lat}&lon={lon}&numberOfClosestPoints=5";
var client = new RestClient(_mapsAPIClosestPointURL + qString);
var response = await client.ExecuteGetTaskAsync(new RestRequest());
dynamic closestPoints = JsonConvert.DeserializeObject(response.Content);
// inspect the response
if (closestPoints != null)
{
// create response object from Maps API response
resp.Trucks = new List <TruckInfo>();
var points = closestPoints.result;
// loop through closest points
foreach (var point in points)
{
var t = await getTruckInfo(sqlConnection, point);
resp.Trucks.Add(t);
}
resp.Header = new ResponseSummary
{
ReqestedLocation = new GeoCoordinate
{
Latitude = lat,
Longitude = lon
},
ElapsedMilliseconds = sw.ElapsedMilliseconds
};
}
return(resp);
}
